Optima SL255 Installation & Software Manual
- Connectivity
- 2G GSM via optional Optima SMART-GSM1 module, plus wired 2-wire bus
- SIM
- Nano (4FF)
- Category
- Intercoms
Polish digital entry panel with GSM calling for apartment blocks.
Digital entry phone panel (Polish mfr) | Re-sourced 2026-08-10 against the ELFON Optima functional-modules catalogue (karta katalogowa, p.3, "Modul przekierowan Optima Smart GSM1"): "Gniazdo kart SIM: nanoSIM (2G) Orange Polska, Plus, T-Mobile Polska". The panel itself is a 2-wire intercom; the SIM sits in the optional OP-S-GSM1 module, which is 2G-ONLY and takes a nanoSIM. Previous sim_form_factor "Standard (2FF)" was wrong and has been corrected to Nano (4FF). Panel manual Tabela 1 (p.6) marks every Optima model TAK for Optima SMART, so GSM is a factory-supported option rather than an aftermarket bolt-on. CAUTION for UK use: module is 2G-only and the datasheet lists Polish operators only.
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